Involved in regulation of planar cell polarity in the compound eye where it is required for correct specification of the R3 and R4 photoreceptor cells by regulating Fz activity in the R3/R4 precursor cells .

Also known as Cadherin-related tumor suppressor (Protein fat).Involved in regulation of planar cell polarity in the compound eye where it is required for correct specification of the R3 and R4 pho

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toreceptor cells by regulating Fz activity in the R3/R4 precursor cells (PubMed:11893338). This is likely to occur through creation of an ft gradient so that the equatorial R3/R4 precursor cell has a higher level of ft function than its polar neighbor (PubMed:15548581). Also required for planar cell polarity of wing hairs (PubMed:12540853, PubMed:15240556). Mediates heterophilic cell adhesion in vitro and is required to stabilize ds on the cell surface (PubMed:15240556). Involved in regulation of eye imaginal disk size (PubMed:23667559). Upstream component of the Hippo pathway where it is likely to act as a cell surface receptor involved in regulation of tissue size and is required for the localization and stability of ex (PubMed:16996265). Probably acts as a cell surface receptor for ds (PubMed:20434335).